Clay Buchholz threw a light bullpen session Tuesday in Toronto. Buchholz will throw in the 'pen again Wednesday.

Manager John Farrell said, "[Wednesday] is a more aggressive bullpen that is planned that will hopefully include some up-and-down inside of that. Today was more of just the normal throwing program that’s outlined.”

No date has been scheduled for a possible rehab start. Buchholz has not pitched since June 8.

Catcher David Ross has moved up to Triple-A Pawtucket after two games with Double-A Portland. Ross has been out since June 18 when he suffered his second concussion of the year.

Ross is eligible to return to the Red Sox on Sunday.

Left handed reliever Matt Thornton felt no symptoms Tuesday after throwing from flat ground. Thornton has been on the DL with a right oblique injury.

John Farrell said, "He’s advancing pretty good given our first initial thought when he first walked off the mound."

Thornton could return to the Red Sox bullpen next Tuesday, but will likely pitch at least one rehab game in the minors.

Red Sox minor league outfielder Ryan Kalish's injury filled career received more bad news. Kalish was scheduled Tuesday to undergo a cervical fusion on his back in Los Angeles. It's Kalish's fourth surgery in less than two years.

“That’s unfortunate," Farrell said. "Obviously it’s one of some severity, and hopefully he gets back to the player that he was when he first came up, because he was an exciting young player."

The Red Sox had once hoped Kalish would be their right fielder for years to come. The Sox even chose to trade Josh Reddick to Oakland believing Kalish would be the better major leaguer. Now it appears Kalish's career could be in jeopardy.